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CN108572689B - Switching power supply, over-temperature control protection method and power control method - Google Patents

Switching power supply, over-temperature control protection method and power control method Download PDF

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Publication number
CN108572689B
CN108572689B CN201710142104.XA CN201710142104A CN108572689B CN 108572689 B CN108572689 B CN 108572689B CN 201710142104 A CN201710142104 A CN 201710142104A CN 108572689 B CN108572689 B CN 108572689B
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Prior art keywords
power supply
switching power
temperature
module
detection module
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CN108572689A (en
Inventor
焦德智
王葆华
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Delta Electronics Shanghai Co Ltd
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Delta Electronics Shanghai Co Ltd
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Priority to CN201710142104.XA priority Critical patent/CN108572689B/en
Priority to TW106124301A priority patent/TWI637585B/en
Priority to US15/869,644 priority patent/US10886725B2/en
Publication of CN108572689A publication Critical patent/CN108572689A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
    • H02H5/042—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using temperature dependent resistors
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/66—Regulating electric power
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
    • G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
    • G01K7/24—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor in a specially-adapted circuit, e.g. bridge circuit
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C9/00—Measuring inclination, e.g. by clinometers, by levels
    • G01C9/02—Details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K3/00—Thermometers giving results other than momentary value of temperature
    • G01K3/005—Circuits arrangements for indicating a predetermined temperature
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
    • G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
    • G01P15/18—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration in two or more dimensions
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M1/327—Means for protecting converters other than automatic disconnection against abnormal temperatures
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
    • H03K2017/0806—Modifications for protecting switching circuit against overcurrent or overvoltage against excessive temperature

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Power Engineering (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Electromagnetism (AREA)
  • Automation & Control Theory (AREA)
  • Dc-Dc Converters (AREA)
  • Protection Of Static Devices (AREA)
  • Artificial Intelligence (AREA)
  • Evolutionary Computation (AREA)
  • Power Sources (AREA)

Abstract

The disclosure relates to a switching power supply, an over-temperature control protection method and a power control method, wherein the switching power supply comprises: the converter module comprises at least one main power switch tube; the direction detection module is used for acquiring the installation direction information of the switching power supply; and the processing module is used for executing preset operation according to the installation direction information of the switching power supply. The power control and over-temperature protection requirements of the switching power supply in all installation directions can be met.

Description

Switching power supply, over-temperature control protection method and power control method
Technical Field
The disclosure relates to the technical field of power electronics, in particular to a switching power supply, an over-temperature control protection method and a power control method.
Background
With the rapid development of power electronic technology, switching power supplies are widely used in many electronic devices because of their small size, portability, and high efficiency.
At present, switching power supply products are continuously developing towards high efficiency, high power density and high reliability, and many switching power supply products must control the temperature of various electronic components inside the switching power supply through external forced heat dissipation measures such as air cooling or water cooling so as to meet the requirements of reliability and safety specifications. However, external heat dissipation measures reduce the reliability and service life of the system and may cause noise interference. Therefore, more and more applications require that the switching power supply can work under the condition of natural heat dissipation, which puts higher requirements on the heat dissipation capability of the switching power supply. On the other hand, as shown in fig. 1, the switching power supply product has 6 spatial installation directions on the X/Y/Z axis in different product applications, and the heat dissipation conditions in each installation direction are different, so that the prior art scheme is difficult to meet the power control requirements and the over-temperature protection requirements of the switching power supply in different installation directions.
Therefore, there is a need to provide a switching power supply that can meet power control requirements in all installation directions.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
An object of the present disclosure is to provide a switching power supply, an over-temperature control protection method, and a power control method, which overcome one or more of the problems due to the limitations and disadvantages of the related art, at least to some extent.
According to an aspect of the present disclosure, there is provided a switching power supply including:
the converter module comprises at least one main power switch tube;
the direction detection module is used for acquiring the installation direction information of the switching power supply; and
and the processing module is used for executing preset operation according to the installation direction information of the switching power supply.
In an exemplary embodiment of the present disclosure, the switching power supply further includes:
the sampling module is used for sampling the temperature of a detection point in the switching power supply; and
the processing module is electrically connected with the sampling module and the direction detection module, and comprises:
the query unit is used for acquiring a temperature threshold corresponding to the installation direction information of the switching power supply from the mapping relation between the installation direction information and the temperature threshold;
the comparison unit is used for comparing the temperature sampled from the sampling module with the temperature threshold acquired from the inquiry unit; and
and the communication unit is used for judging whether to start over-temperature protection according to the comparison result of the comparison unit and sending a judgment result signal to the converter module.
In an exemplary embodiment of the disclosure, the converter module receives the determination result signal output by the processing module, and controls the main power switch tube of the switching power supply.
In an exemplary embodiment of the present disclosure, the sampling module includes a thermistor temperature detection module or a digital temperature detection module.
In an exemplary embodiment of the present disclosure, the thermistor temperature detecting unit includes:
the first end of the reference resistor is connected with a first voltage end;
and the first end of the thermistor is connected with the second end of the reference resistor, and the second end of the thermistor is connected with a second voltage end.
In an exemplary embodiment of the present disclosure, the direction detection module includes a gravity sensor.
In an exemplary embodiment of the present disclosure, the processing module includes:
the state judgment unit is used for judging the motion state of the switching power supply according to the acceleration information of the switching power supply detected by the direction detection module;
a storage unit for storing at least one of the acceleration information and the motion state.
In an exemplary embodiment of the present disclosure, the processing module further includes:
and the alarm unit is used for outputting an alarm signal when the state judgment unit judges that the switching power supply is in a falling or vibrating state.
In an exemplary embodiment of the present disclosure, the direction detection module includes a gravity sensor; judging the motion state of the switching power supply comprises the following steps:
judging whether the acceleration information of the switching power supply sensed by the gravity sensor is in a single direction or alternatively positive and negative;
when the acceleration information sensed by the gravity sensor is judged to be in a single direction, determining that the switching power supply is in a falling state; and
and when the acceleration information sensed by the gravity sensor is judged to be positive and negative alternation, determining that the switching power supply is in a vibration state.
According to an aspect of the present disclosure, there is provided an electronic device including the switching power supply according to any one of the above.
According to one aspect of the present disclosure, an over-temperature control protection method is provided, which is applied to a switching power supply, where the switching power supply includes a direction detection module, a sampling module, and a processing module, and the over-temperature control protection method includes:
sampling the temperature of a detection point in the switching power supply through the sampling module;
acquiring installation direction information of the switching power supply through the direction detection module;
acquiring a temperature threshold corresponding to the installation direction information of the switching power supply from a mapping relation between the installation direction information and the temperature threshold according to the installation direction information;
comparing the sampled temperature with the acquired temperature threshold; and
and judging whether to start over-temperature protection according to the compared result.
In an exemplary embodiment of the present disclosure, the over-temperature control protection method further includes:
and sending the judgment result signal to the converter module, and controlling the output power of the switching power supply through the processing module.
According to an aspect of the present disclosure, there is provided a power control method applied to a switching power supply, where the switching power supply includes a direction detection module and a processing module, the power control method includes:
detecting the installation direction of the switching power supply through the direction detection module; and
controlling one or more of an output power, an output voltage, and an output current of the switching power supply by the processing module according to the detected mounting direction.
In an exemplary embodiment of the present disclosure, the power control method further includes:
judging the motion state of the switching power supply according to the acceleration information of the switching power supply detected by the direction detection module;
storing at least one of the acceleration information and the motion state.
In an exemplary embodiment of the present disclosure, determining the motion state of the switching power supply includes:
judging whether the acceleration information of the switching power supply detected by the direction detection module is in a single direction or alternatively positive and negative;
when the acceleration information detected by the direction detection module is judged to be in a single direction, determining that the switching power supply is in a falling state; and
and when the acceleration information detected by the direction detection module is judged to be positive and negative alternation, determining that the switching power supply is in a vibration state.
According to the switching power supply of the present exemplary embodiment, the mounting direction information of the switching power supply is acquired by the direction detection module, and the predetermined operation is performed according to the acquired mounting direction information. On one hand, the installation direction information of the switching power supply is obtained through the direction detection module, and the installation direction information of the switching power supply can be obtained when the installation direction of the switching power supply is changed; on the other hand, predetermined operations are performed according to the obtained installation direction information, and the power control and over-temperature protection requirements of the switching power supply in all installation directions can be met.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.
Fig. 1 schematically shows a schematic view of an exemplary switching power supply in 6 installation directions in space;
fig. 2 schematically shows a schematic structural diagram of an over-temperature protection circuit for temperature detection by using a Thermistor (NTC Thermistor) in a technical scheme;
fig. 3 schematically illustrates a block diagram of a switching power supply according to an exemplary embodiment of the present disclosure;
FIG. 4 schematically illustrates a circuit diagram for detecting a temperature signal using a thermistor according to an exemplary embodiment of the present disclosure;
FIG. 5 schematically illustrates a circuit diagram for detecting a temperature signal using a digital temperature sensor according to an exemplary embodiment of the present disclosure;
FIG. 6 schematically illustrates a control block diagram of temperature protection in conjunction with mounting direction detection, according to an exemplary embodiment of the present disclosure;
FIG. 7 schematically illustrates an over-temperature protection control flow diagram in conjunction with gravity information detection, according to an exemplary embodiment of the present disclosure;
fig. 8 schematically illustrates a control flow chart of collecting changes of gravity/acceleration information in a processing module to record the falling or vibration of the switching power supply according to an exemplary embodiment of the present disclosure;
FIG. 9 schematically illustrates an internal block diagram of a processing module according to another exemplary embodiment of the present disclosure;
FIG. 10 schematically illustrates a block diagram of a generalized switching power supply assist control including a gravity sensor, according to an example embodiment of the present disclosure;
FIG. 11 schematically illustrates a flow chart of an over-temperature control protection method according to an exemplary embodiment of the present disclosure; and
fig. 12 schematically illustrates a flow chart of a power control method according to an exemplary embodiment of the present disclosure.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and the like. In other instances, well-known technical solutions have not been shown or described in detail to avoid obscuring aspects of the present disclosure.
Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.
The application of the switching power supply is limited by the temperature resistance of electronic components, and in special application fields such as medical fields, the temperature protection is needed to ensure that the temperature of the electronic components cannot exceed the temperature resistance value of the electronic components under any normal working condition, over-temperature overload and other abnormal conditions.
In the technical scheme shown in fig. 2, a negative temperature coefficient Thermistor (NTC Thermistor) is used for detecting temperature to perform over-temperature protection. In fig. 2, Vref1 is a voltage reference value, Rx is a voltage dividing resistor, NTCx is a thermistor, the thermistor NTCx is generally placed near a component with serious heat generation in a switching power supply, the voltage dividing resistor Rx and the thermistor NTCx form a voltage dividing network related to Vref1, the voltage divided by the voltage dividing network is input to the negative terminal of a comparator after being followed by a signal, and the positive terminal of the comparator is connected with a voltage reference value Vref 2. When the power load becomes heavy or the ambient temperature rises, the heating of the element is more serious, so the resistance value of the thermistor with the negative temperature coefficient can fall along with the rise of the temperature, the temperature detection voltage entering the negative end of the comparator also falls, when the temperature detection voltage falls to be lower than Vref2, the comparator can output a high-level protection control signal to the protection circuit module, and the protection circuit module can close the switching power supply according to the received protection signal and perform control to reduce the heating amount so as to achieve the effect of controlling the temperature.
Because the electronic components in the switching power supply are heated seriously and are not single but simultaneously coexist a plurality of heating points such as magnetic components, semiconductor switching devices and the like, temperature detection cannot be designed for all the heating points in a one-to-one correspondence manner, and usually only the component with the highest temperature in the switching power supply is detected. However, as shown in fig. 1, in practical applications, the application of a standard switching power supply to a client does not know which installation method is used, and the hottest heating point temperature detected by the thermistor NTC under an original fixed condition may become a non-hottest heating point along with the change of the installation direction, and usually, the use power of each installation direction is defined to meet that the component temperature of each installation direction under normal operation does not exceed the temperature-resistant specification, but the trigger point of the over-temperature protection is fixed, for the switching power supply product applied to the medical apparatus, the temperature under an abnormal condition also meets the component specification, which is difficult to be ensured in each installation direction, and the power control requirement and the over-temperature protection requirement of each installation direction cannot be ensured, which is undoubtedly a lack of application for a standard switching power supply. In addition, under the condition of natural heat dissipation, the temperature of the electronic component is greatly influenced by the installation direction, and the power control requirement and the over-temperature protection requirement in all the installation directions are difficult to meet in the prior art scheme.
Based on the above, in the present exemplary embodiment, a switching power supply is first provided. Referring to fig. 3, the switching power supply includes: a transformer module 310, a direction detection module 320, and a processing module 330. Wherein:
the converter module 310 includes at least one main power switch;
a direction detection module 320, configured to obtain installation direction information of the switching power supply; and
and the processing module 330 is configured to execute a preset operation according to the installation direction information of the switching power supply.
According to the switching power supply of the present exemplary embodiment, on one hand, the direction detection module obtains the installation direction information of the switching power supply, and can obtain the installation direction information of the switching power supply when the installation direction of the switching power supply is changed; on the other hand, by executing predetermined operation according to the obtained installation direction information, the power control requirements and the over-temperature protection requirements of the switching power supply in all installation directions can be met.
It is to be noted that, in the present exemplary embodiment, the preset operations may include a preset operation related to the over-temperature protection and a preset operation related to the power control, but the preset operations in the exemplary embodiment of the present disclosure are not limited thereto, and for example, the preset operations may also include a preset operation related to the drop or shock detection, a preset operation related to the processing of the installation direction information, and the like, which are also within the scope of the present disclosure.
Further, in the present exemplary embodiment, in order to detect the temperature of the switching power supply, the switching power supply 300 may further include: and the sampling module is used for sampling the temperature of a detection point in the switching power supply. Fig. 4 and 5 show two methods for sampling the temperature of the detection point in the switch power supply, and the acquired temperature sampling information is transmitted to a digital controller, i.e. a processing module.
Fig. 4 is a schematic diagram of a circuit for obtaining the temperature of a detection point by voltage division using a thermistor. As shown in fig. 4, a thermistor is close to a hot spot to be detected, a voltage division network of the thermistor is used to convert a temperature signal into a voltage signal, and if an analog comparator is used, a temperature protection signal can be obtained by a conventional comparison method shown in fig. 2 based on a sampling signal. In fig. 4, a Digital Controller (Digital Controller) is used at a receiving end of a post stage of the detection circuit, and the comparator can be conveniently integrated in the Digital Controller and then processed by logic operation in the Digital Controller, or can be processed by a separate comparator. Fig. 5 is a diagram showing the temperature of the detection point obtained by a digital temperature sensor (temperature sensor). In fig. 5, a temperature sensor is close to a hot spot to be detected, digital information of temperature is acquired, and the temperature information is transmitted to a digital controller as control information through a digital communication protocol.
It should be noted that, in the present exemplary embodiment, part of the processing in the processing module may be implemented by a digital control manner, or may be implemented by an analog control manner, and the disclosure does not specifically limit this. When the processing module is implemented by means of digital control, the processing module may be referred to as a digital controller.
Further, in this exemplary embodiment, the processing module is electrically connected to the sampling module and the direction detecting module, and in order to perform an over-temperature protection control on the switching power supply, the processing module may include: the query unit is used for acquiring a temperature threshold corresponding to the installation direction information of the switching power supply from the mapping relation between the installation direction information and the temperature threshold; the comparison unit is used for comparing the temperature sampled from the sampling module with the temperature threshold acquired from the inquiry unit; and the communication unit is used for judging whether to start over-temperature protection according to the comparison result of the comparison unit and sending a judgment result signal to the converter module of the switching power supply.
Further, in the present exemplary embodiment, in order to detect the installation direction of the switching power supply, the direction detection module 310 may further include a gravity sensor through which the installation direction of the switching power supply 300 is detected, but the exemplary embodiments of the present disclosure are not limited thereto, and for example, the direction detection module 310 may further include other direction detection devices such as a gyroscope and the like through which the installation direction of the switching power supply 300 is detected, which also belongs to the protection scope of the present disclosure.
Further, in the present exemplary embodiment, a gravity sensor (G-sensor) may be employed as a medium for direction detection to detect the installation direction of the switching power supply. The gravity sensor can be a chip in a patch package form, and is flatly pasted and welded on the surface of the printed circuit board. The gravity sensor can transmit the detected gravity information, i.e. the installation direction, to the processing module through a standard communication protocol. Fig. 6 shows a control block diagram in combination with mounting direction detection, taking the sampling mode of fig. 4 as an example.
As shown in fig. 6, a first terminal of the reference resistor Rx is connected to a first voltage terminal Vref 1. The first terminal of the thermistor NTCx is connected to the second terminal of the reference resistor Rx, the second terminal of the thermistor is connected to a second voltage terminal, for example, a ground terminal, and the comparator is integrated in the processing module of the switching power supply, and the comparison result signal can be transmitted to the converter module of the switching power supply through the I/O port of the processing module. The gravity sensor is in communication connection with the processing module and can send sensed X/Y/Z axis information to the processing module through a standard communication protocol.
Fig. 7 shows a specific flowchart for implementing the over-temperature protection in combination with the installation direction, where in fig. 7, on one hand, the temperature signal Tsense acquired from the power supply voltage dividing network is transmitted to the processing module through the follower, or the temperature signal Tsense is acquired by the digital temperature sensor and transmitted to the processing module, and the processing module receives the temperature signal Tsense sent by the temperature detection circuit through the I/O port. On the other hand, direction information of six axes of + X/-X/+ Y/-Y/+ Z/-Z for installing the switching power supply is obtained through a gravity sensor, the obtained installation direction information is transmitted to a processing module through a standard communication protocol, the installation direction information of the six axes of + X/-X/+ Y/- + Z/-Z is processed inside the processing module to obtain the actual power supply installation direction, an over-temperature protection comparison reference Vref corresponding to the installation direction of the switching power supply at the moment is obtained after searching a preset over-temperature protection information table corresponding to different installation directions, the over-temperature protection comparison reference Vref is compared with the acquired temperature information Tsense, and if the over-temperature protection comparison reference Vref is greater than the acquired temperature information Tsense, the actually acquired temperature exceeds the preset protection temperature, therefore, over-temperature protection is triggered, and the I/O port of the processing module outputs a corresponding protection signal to the over-temperature protection circuit to control the turn-off of a main power switch tube of the main power converter.
Therefore, when the installation direction of the switching power supply is changed, the processing module can adjust the height of the over-temperature protection comparison reference according to the actual installation direction of the switching power supply, so that the element temperature safety when the over-temperature occurs in each installation direction is ensured.
Further, in the present exemplary embodiment, the gravity sensor may acquire acceleration in addition to the position information. Therefore, in order to detect an abnormal condition, such as a condition when the switching power supply is in a shock or a drop, the processing module may further include: and the state judgment unit is used for judging the motion state of the switching power supply according to the acceleration information of the switching power supply detected by the direction detection module. Furthermore, the processing module may further comprise a storage unit for storing the detected acceleration information and/or the resulting movement state of the switching power supply. In addition, in order to send out prompt information when an abnormal condition occurs, the processing module can further comprise an alarm unit which is used for outputting an alarm signal when the state judgment unit judges that the switching power supply is in a falling or vibrating state.
Further, in the present exemplary embodiment, the determining the motion state of the switching power supply may include: judging whether the acceleration information of the switching power supply sensed by the gravity sensor is in a single direction or alternatively positive and negative; when the acceleration information sensed by the gravity sensor is judged to be in a single direction, determining that the switching power supply is in a falling state; and when the acceleration information sensed by the gravity sensor is judged to be positive and negative alternation, determining that the switching power supply is in a vibration state.
Fig. 8 shows a flowchart for determining whether the switching power supply handles a falling or vibrating state based on a change in gravity/acceleration information of the switching power supply. As shown in fig. 8, the gravity/acceleration information of the switching power supply is collected by the gravity sensor, and when the acceleration of the switching power supply changes, the storage unit of the processing module records all acceleration changes. And then, judging the motion state of the switching power supply based on the recorded acceleration change of the switching power supply, recording the motion state of the switching power supply as a falling state if the acceleration information sensed by the gravity sensor is judged to be in a single direction, and recording the motion state of the switching power supply as a vibration state when the acceleration information sensed by the gravity sensor is judged to be in a positive and negative alternation state.
Fig. 9 shows a block diagram of a processing module according to another embodiment of the present disclosure, and the processing module in fig. 9 may include: an arithmetic processing unit, a memory unit and a communication unit. The arithmetic processing unit may include the comparing unit and the querying unit. In this exemplary embodiment, the processing module includes an operation processing unit inside to implement information receiving and operation functions, the memory unit may be configured to store a mapping relationship table of preset control information, installation direction information, and a temperature threshold, and the communication unit may implement communication real-time information transmission with an external gravity sensor.
Fig. 10 is a general block diagram for flexibly controlling the switching power supply using gravity information in the present exemplary embodiment. In fig. 10, the switching power supply may include a gravity sensor, a processing module, and a main power converter. The embodiment of the present invention is not limited to the over-temperature protection control, and may adjust parameters such as the output power, the output voltage, the output current, and the over-voltage protection point, that is, the temperature threshold, of the switching power supply based on the gravity information. In addition, the gravity sensor can collect acceleration besides direction information, so that the motion state of the switching power supply in the use of an actual client can be recorded and stored through the processing module, whether the switching power supply falls down or shakes seriously can be judged, and once the client fails, the failure reason of the client can be analyzed in an auxiliary mode.
In this exemplary embodiment, an over-temperature control protection method is further provided, and is applied to a switching power supply, where the switching power supply includes a direction detection module, a sampling module, and a processing module. Referring to fig. 11, the over-temperature control protection method may include the steps of:
step S1110, sampling the temperature of a detection point in the switching power supply through the sampling module;
step S1120, acquiring installation direction information of the switching power supply through the direction detection module;
s1130, acquiring a temperature threshold corresponding to the installation direction information of the switching power supply from a mapping relation between the installation direction information and the temperature threshold according to the installation direction information;
step S1140, comparing the sampled temperature with the acquired temperature threshold; and
and S1150, judging whether to start over-temperature protection according to the compared result.
According to the over-temperature control protection method of the embodiment, the temperature information of the switching power supply can be obtained in real time by sampling the temperature of the detection point in the switching power supply; the installation direction of the switching power supply is detected through the direction detection module, so that the installation direction information of the switching power supply can be obtained in real time; and acquiring a temperature threshold corresponding to the installation direction information, comparing the temperature obtained by sampling with the acquired temperature threshold, and judging whether to start over-temperature protection according to a comparison result, so that reliable and safe over-temperature protection can be realized in different installation directions.
The method of the overheat control protection in the present exemplary embodiment will be described in detail below.
In step S1110, the temperature of the detection point in the switching power supply is sampled by the sampling module.
In the present exemplary embodiment, the sampling module may be a digital sampling module, but the sampling module in the exemplary embodiment of the present disclosure is not limited thereto, for example, the sampling module may also be an analog sampling module, and the present disclosure is not particularly limited thereto. Fig. 4 and 5 respectively show schematic diagrams of temperature sampling in an analog manner and temperature sampling in a digital manner, which will not be described herein again since fig. 4 and 5 have been described above.
Next, in step S1120, installation direction information of the switching power supply is acquired by the direction detection module.
In this exemplary embodiment, the direction detection module may include a gravity sensor, through which the installation direction of the switching power supply is detected, but the exemplary embodiments of the present disclosure are not limited thereto, and for example, the direction detection module may further include other direction detection devices, such as a gyroscope and the like, through which the installation direction of the switching power supply is detected, which also belongs to the protection scope of the present disclosure. Under the condition that the direction detection module comprises the gravity sensor, the gravity sensor can be a chip in a patch packaging form, is flatly pasted and welded on the surface of the printed circuit board, and sends detected gravity information, namely the installation direction to the digital controller through a standard communication protocol.
Next, in step S1130, a temperature threshold corresponding to the mounting direction information of the switching power supply is acquired from a mapping relationship between the mounting direction information and the temperature threshold based on the mounting direction information.
In this exemplary embodiment, a mapping relation table between the installation direction information and the temperature threshold may be preset in the processing module of the switching power supply. As shown in fig. 7, when an I/O port of a processing module receives temperature signal information Tsense transmitted by a temperature detection line, a gravity sensor simultaneously sends six-axis direction information of + X/-X/+ Y/-Y/+ Z/-Z installed on a switching power supply to the processing module through a standard communication protocol, the processing module processes the six-axis installation direction information of + X/-X/+ Y/-Y/+ Z/-Z to obtain an actual power supply installation direction, and a preset mapping relation table is searched to obtain an over-temperature protection comparison reference, i.e., a temperature threshold Vref, corresponding to the installation direction of the switching power supply at this time.
Next, in step S1140, the sampled temperature is compared with the acquired temperature threshold.
In this example embodiment, when the temperature threshold Vref, which is the overtemperature protection comparison reference corresponding to the installation direction of the switching power supply, is found, the sampled temperature signal Tsense may be compared with the temperature threshold Vref, which is the overtemperature protection comparison reference.
Next, in step S1150, it is determined whether or not to activate over-temperature protection according to the compared result.
In this exemplary embodiment, if the temperature threshold Vref is greater than the sampled temperature signal Tsense, which indicates that the actually acquired temperature exceeds the preset safety protection temperature, the over-temperature protection is triggered, and the I/O port of the processing module outputs a corresponding protection signal to the over-temperature protection line to control the turn-off of the main power converter. Therefore, in this exemplary embodiment, when the installation direction changes, the processing module may adjust the over-temperature protection comparison reference, i.e., the temperature threshold, according to the actual installation direction of the switching power supply, so as to ensure the safety of the component temperature when the over-temperature occurs in each installation direction.
Furthermore, in this example embodiment, after the over-temperature protection is started, the output power of the switching power supply needs to be controlled, so the over-temperature control protection method may further include: and sending the judgment result signal to a converter module of the switching power supply, and controlling the output power of the switching power supply through a processing module.
Further, the present disclosure may also cover more flexible control of the switching power supply using gravity information in digital control. Therefore, in this exemplary embodiment, a power control method is further provided, where the power control method may be applied to a switching power supply, where the switching power supply includes a direction detection module and a processing module, and referring to fig. 12, the power control method may include the following steps:
step 1210, detecting the installation direction of the switching power supply through the direction detection module; and
and step 1220, controlling one or more of output power, output voltage and output current of the switch power supply through the processing module according to the detected installation direction.
According to the power control method in the present exemplary embodiment, one or more of the output power, the output voltage, and the output current of the switching power supply are controlled based on the detected mounting direction, the output power of the switching power supply in different mounting directions can be controlled accordingly, and optimization of the output power, the output voltage, or the output current in each mounting direction can be achieved.
The power control method in the present exemplary embodiment is further described below.
In step 1210, the installation direction of the switching power supply is detected by the direction detection module.
Since the method of detecting the mounting direction of the switching power supply in the present exemplary embodiment is similar to the aforementioned method of detecting the mounting direction of the switching power supply, detailed description thereof will be omitted.
In step 1220, one or more of the output power, the output voltage, and the output current of the switching power supply are controlled by the processing module according to the detected installation direction.
In the embodiment of the example, more flexible control of the switching power supply by collecting the gravity information can be realized. For example, when the switching power supply has multiple installation directions, the maximum power that can be output in each installation direction may be different, and then after the gravity sensing information is collected, the output power may be limited according to the current installation direction, so as to avoid the output power of the switching power supply exceeding the maximum allowable value. Parameters such as output voltage and output current of the switching power supply can be adjusted based on gravity information, so that specific requirements are met, and flexible control is realized.
Further, in this example embodiment, the power control method may further include:
judging the motion state of the switching power supply according to the acceleration information of the switching power supply detected by the direction detection module;
storing at least one of the acceleration information and the motion state.
Further, in the present exemplary embodiment, determining the motion state of the switching power supply may include:
judging whether the acceleration information of the switching power supply detected by the direction detection module is in a single direction or alternatively positive and negative;
when the acceleration information detected by the direction detection module is judged to be in a single direction, determining that the switching power supply is in a falling state; and
and when the acceleration information detected by the direction detection module is judged to be positive and negative alternation, determining that the switching power supply is in a vibration state.
Since the above steps are similar to the method for determining the falling or the vibration in fig. 8, the detailed description thereof will be omitted.
Further, in another exemplary embodiment of the present disclosure, there is also provided an electronic device, which may include the switching power supply according to any one of the foregoing embodiments. Since the electronic device in the present exemplary embodiment employs the above-described switching power supply, there are at least all advantages corresponding to the switching power supply.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (6)

1. A switching power supply, comprising:
the converter module comprises at least one main power switch tube;
the direction detection module comprises a gravity sensor and is used for acquiring the installation direction information and the acceleration information of the switch power supply when the installation direction of the switch power supply changes; and
the sampling module is used for sampling the temperature of a detection point in the switching power supply;
the processing module is electrically connected with the sampling module and the direction detection module and used for executing preset operation according to the installation direction information of the switching power supply, and the processing module comprises:
the query unit is used for acquiring a temperature threshold corresponding to the installation direction information of the switching power supply from the mapping relation between the installation direction information and the temperature threshold;
the comparison unit is used for comparing the temperature sampled from the sampling module with the temperature threshold acquired from the inquiry unit;
the communication unit is used for judging whether to start over-temperature protection according to the comparison result of the comparison unit and sending a judgment result signal to the converter module;
the state judgment unit is used for judging the motion state of the switching power supply according to the acceleration information of the switching power supply detected by the direction detection module, judging whether the acceleration information of the switching power supply sensed by the gravity sensor is in a single direction or alternatively positive and negative, and determining that the switching power supply is in a falling state when the acceleration information sensed by the gravity sensor is judged to be in the single direction; when the acceleration information sensed by the gravity sensor is judged to be positive and negative alternation, determining that the switching power supply is in a vibration state;
a storage unit for storing at least one of the acceleration information and the motion state;
and the alarm unit is used for outputting an alarm signal when the state judgment unit judges that the switching power supply is in a falling or vibrating state.
2. The switching power supply according to claim 1, wherein the converter module receives the judgment result signal output by the processing module to control the main power switch tube of the switching power supply.
3. The switching power supply according to claim 1, wherein the sampling module comprises a thermistor temperature detection module or a digital temperature detection module.
4. The switching power supply according to claim 3, wherein the thermistor temperature detecting unit includes:
the first end of the reference resistor is connected with a first voltage end;
and the first end of the thermistor is connected with the second end of the reference resistor, and the second end of the thermistor is connected with a second voltage end.
5. An electronic device comprising the switching power supply according to any one of claims 1 to 4.
6. A power control method is applied to a switching power supply, the switching power supply comprises a direction detection module and a processing module, and the power control method comprises the following steps:
when the installation direction of the switching power supply changes, the installation direction of the switching power supply is detected through the direction detection module; and
controlling one or more of output power, output voltage and output current of the switching power supply through the processing module according to the detected mounting direction;
judging the motion state of the switching power supply according to the acceleration information of the switching power supply detected by the direction detection module, and judging whether the acceleration information of the switching power supply detected by the direction detection module is in a single direction or alternatively positive and negative;
when the acceleration information detected by the direction detection module is judged to be in a single direction, determining that the switching power supply is in a falling state;
when the acceleration information detected by the direction detection module is judged to be positive and negative alternation, the switching power supply is determined to be in a vibration state;
storing at least one of the acceleration information and the motion state;
and outputting an alarm signal when the switching power supply is in a falling or vibrating state.
CN201710142104.XA 2017-03-10 2017-03-10 Switching power supply, over-temperature control protection method and power control method Active CN108572689B (en)

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